Abstract
The article shows the results of studies the platinum mineralization (within the framework of studying the complexity of deposits) in the waste of heavy concentrate in the southeastern flank of the Bolotisty gold-placer deposit, which the located in the Khabarovsky Krai (Russia). The deposit is localized in the “erosion window” among the covers of Miocene basalts and Eocene andesites, where Cretaceous sedimentary, tuffaceous-sedimentary rocks of the basement of the volcano structure, broken through by an Eocene intrusive body of intermediate and basic composition, come to the surface. An abbreviated mineralogical analysis for monofraction of precious metals was carried out for a concentrate fraction weighing 1.813 kg with a grain size of -3.0 + 0.1 mm. Gold and platinum were found - 1.38 mg and 1.08 mg. Platinum has an iron impurity up to 3-5 % Fe and Cu, Ir, Rh impurities are variable. There are plate-like inclusions of native osmium with an admixture of ruthenium in 43 % of the studied platinum grains. There are single inclusions of ehrlichmanite. A large amount of high-temperature dipyramidal quartz, along with magnetite, chromite, tourmaline and other minerals is a characteristic feature of the concentrate and platinum grains of this area.
Highlights
Ore complex deposits of various genesis, containing platinum, and gold-placer deposits, in which platinoids are found, according to the results of the recent decades scientific research, and geological and mining operations in the south of the Far East
The composition of the studied platinum grains is peculiar: platinum predominates with a low iron content, stable up to 3-5%
Areas with rhodium and iridium content are observed in grains variably; plates of native osmium with an admixture of ruthenium are present in 20% of platinum grains; ehrlichmanite crystals are isolated
Summary
Ore complex deposits of various genesis, containing platinum (for example, ironmanganese Poperechnoe deposit, gold-copper-porphyry Malmyzh deposit [1, 2]), and gold-placer deposits, in which platinoids are found, according to the results of the recent decades scientific research, and geological and mining operations in the south of the Far East. Platinum mineralization of the Upper Amur province is concentrated in a sub-latitudinal strike. In this area, there are 3 potential platinum-bearing metallogenic zones: Dambukino-Tyndinskaya, DzhagdySelemdzhinskaya and Severo-Bureinskaya. The platinoid content in these placers was comparable to that of Au. The Stanovaya and Maimakan platinum-bearing zones are known in the Priokhotsk province. Platinoids were found all over the placers of the Fadeevka brook and the Zolotoy spring Their approximate content was estimated by the prospectors as 1: (50-70) to the amount of gold. A rich gold-bearing placer with large high-grade (average fineness 948) gold is mined in the northern part of the zone at the Bolotisty site located in the upper reaches of the Khor river. The rocks contain thin veinlets of fine crystalline quartz [5, 6]
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